System for Retrieval of Email Certificates from Remote Certificate Repository

1. A method for retrieving email recipient information, comprising: receiving an email request from a client device at a proxy server, the request intended for an email server and comprising a request for a certificate associated with the email recipient; determining that the client device is compliant with a compliance rule; rerouting a first portion of the email request to a certificate repository implemented in a server separate from a certificate repository maintained by the email server; receiving the requested certificate from the certificate repository; generating a response to the client device based on the received certificate and information received separately from the email server; and sending the response to the client device.

2. The method of claim 1 , further comprising removing the request for the certificate from the email request prior to rerouting, wherein rerouting the first portion of the email request comprises rerouting the request for the certificate.

3. The method of claim 1 , wherein the email request comprises a request for recipient email information, and wherein the method further comprises sending the request for recipient email information to the email server.

4. The method of claim 3 , wherein the information received separately from the email server comprises the recipient email information.

5. The method of claim 3 , wherein the recipient email information is received from the email server in response to providing a second portion of the email request to the email server.

6. The method of claim 1 , wherein rerouting the first portion of the email request is performed in response to determining that the client device is compliant with the compliance rule.

7. The method of claim 1 , further comprising revoking an email certificate associated with the client device based on determining that the client device is not compliant with a compliance rule.

8. A non-transitory, computer-readable medium containing instructions executed by a hardware-based processor to perform stages for retrieving email recipient information, the stages comprising: receiving an email request from a client device at a proxy server, the request intended for an email server and comprising a request for a certificate associated with the email recipient; determining that the client device is compliant with a compliance rule; rerouting a first portion of the email request to a certificate repository implemented in a server separate from a certificate repository maintained by the email server; receiving the requested certificate from the certificate repository; generating a response to the client device based on the received certificate and information received separately from the email server; and sending the response to the client device.

9. The non-transitory, computer-readable medium of claim 8 , the stages further comprising removing the request for the certificate from the email request prior to rerouting, wherein rerouting the first portion of the email request comprises rerouting the request for the certificate.

10. The non-transitory, computer-readable medium of claim 8 , wherein the email request comprises a request for recipient email information, and wherein the method further comprises sending the request for recipient email information to the email server.

11. The non-transitory, computer-readable medium of claim 10 , wherein the information received separately from the email server comprises the recipient email information.

12. The non-transitory, computer-readable medium of claim 10 , wherein the recipient email information is received from the email server in response to providing a second portion of the email request to the email server.

13. The non-transitory, computer-readable medium of claim 8 , wherein rerouting the first portion of the email request is performed in response to determining that the client device is compliant with the compliance rule.

14. The non-transitory, computer-readable medium of claim 8 , the stages further comprising revoking an email certificate associated with the client device based on determining that the client device is not compliant with a compliance rule.

15. A system for retrieving email recipient information, comprising: a non-transitory, computer-readable medium that contains instructions; a hardware-based processor that executes the instructions to perform stages including: receiving an email request from a client device at a proxy server, the request intended for an email server and comprising a request for a certificate associated with the email recipient; determining that the client device is compliant with a compliance rule; rerouting a first portion of the email request to a certificate repository implemented in a server separate from a certificate repository maintained by the email server; receiving the requested certificate from the certificate repository; generating a response to the client device based on the received certificate and information received separately from the email server; and sending the response to the client device.

16. The system of claim 15 , the stages further comprising removing the request for the certificate from the email request prior to rerouting, wherein rerouting the first portion of the email request comprises rerouting the request for the certificate.

17. The system of claim 15 , wherein the email request comprises a request for recipient email information, and wherein the method further comprises sending the request for recipient email information to the email server.

18. The system of claim 17 , wherein the information received separately from the email server comprises the recipient email information.

19. The system of claim 17 , wherein the recipient email information is received from the email server in response to providing a second portion of the email request to the email server.

20. The system of claim 15 , wherein rerouting the first portion of the email request is performed in response to determining that the client device is compliant with the compliance rule.